Molding-press apparatus



March 29, 1927.

H. M. STURGEON MOLDING PRESS APPARATUS Filed Feb.' 18, 1926 3 Sheets-Sheet 1 1,623,022 M h 29, 1927- H M, STURGEON MOLDING PRESS APPARATUS Filed Feb. 18, 1926 s Sheets-Sheet 2 March 29 1927.

H. M. STURGEQN MOLDI NG PRES S APPARATUS Filed Feb. 18, 1926 3 Sheets-Sheet 3 Alli/9171111471!!! Patented Mar. 29 192?.

f UNITED s'rerlzs mono in. s'rncanon, or unis, PENNSYLVANIA, n'ssrononor ONE-HALF T0 W. HD'LTEL, on ERIE, rnnnsYnvAmA.

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Louis monomer-runes APPARATUS.

Application filed February 18; 1926. Serial No. 89,100.

This invention relates to rubber molding aratus,

suitable press andnlold mechanism adapted to receive a suitable mass of rubber or other compound and by applying pressure to said mass of com o'und, causing the compound to fillthe moi" cavity, and be maintained under pressure during the required period.

To providein such an apparatus suitable guides so that the-vertically movable parts will be guided properly when entering the mold-box so as to ensure the side walls of themolded article being of uniform thickness.

To so construct the apparatus'that when heat is used heated portions thereof, in their expansion and contraction, will not efiect the frame of the apparatus and cause the same to become out of alignment.

In carrying out the objects of. this invention, a mold case is provided having a molcbplate receiving recess therethrougmand j is also provided with cavities by means of which the tenrerature oi the mold case can be regulate. This mold-case stands on a base plate which is also provided with cavities bynleans of which its temperature can be 'rcgulatuh'so that the temperature of the side and bottom surfaces of the mold- 'piate receivinr recess can be regulated as desired. Wit lin the moldqnlate receiving recess, a set'ot' separable mold side plates, articulated upon a bottom .nlold-plate is placed.

In the base ol'fthe apparatus is placed a cylinder andpiston mechanism adapted to be operated by fluid, 'and the piston rod-of this mechnis'm is secured to the bottom moldplate in the mold-plate receiving recess in the mold-case, andcan thereby be forced upwardly'ou't of said recess, and then drawn downwardly into place within saidreccss. A prcss headelatc' is provided, upon which is secured a cylinder in which are placed two pistons,- one above the other, with a piston rod connected to one oi? said pistons and a core-mold secured to the lower end of said piston-rod, while another piston-rod is con nected to the other piston, and has secured to the lower end thereof lncans'to engage the upper ends of said lnold lates by which means the mold-plates can" e pressed down- .ap he ob ect of this invention is to provide waldly while the core-mold is being pulled upwardly.

Tlhese and other features of this invention are hereinafter fully described and pointed out, and are illustrated in the 1.00011113111131 in drawings, in which:

Figure 1 is a vertical central section of a rubber molding apparatus constructed according to this invention. Figure 2 is a side elevation of the same. Figure 3-is a plan view thereof. I Figure 4 is a horizontal section of the same on the line l4 in .Fig. 1.

. Fi ure 5 isfa like section on the line 5-5 in Fig. 1.

Figure 6 is a like section on the line 6--6 in Fig. .1.

Figure 7 is alike section on the line "(-7 in Fig. 1.

Figure 8 is a plan view-of the moldcase removed from the apparatus.

Figure 9 is a transverse section of this rubber molding apparatus on the line 99 in Fig. 1.

In these drawings A indicates the base plate of the apparatus, and A indicates the base 'lramethereof which has a top late A having a central opening, a, theret rough. Mounted u )Oll the top plate A is the main frame B oi the apparatus having a bottom plate B which engages the top-plate A of the base frame A, and is provided with a central opening thcrethrough which coincides with tllc'opening a in'the top plate A*. Within the main frame 13 upon the bottom B. thereof is placed the bottom plate G of the moldcase. This bottom plate C is provided with a central opening G, therethrough, and with steam or water receiving cavities 0 in the body thereof. Upon the bottom plate 0 within the frame B is placed a mold case I), see Fig. 8, having a moldplate receiving recess D therethrough, and is provided with steam or water receiving cavities d by means oi which the tem.erature of the same may be regulated. Tpon the frame B when heat is to be used is placed a plate 1 having an opening tllerethrough which coincides with the mold plate I'EBGIV! ing recess D in the lnold-cuse D, and other-- is another piston K,

sisting material 5 to insulate the metal of the-main frame B from heat radiated from the heated mold-case D and mold case bottom plate C, so that the main frame B will not be subject to expansion or contraction.

Upon the base plate A and within the base frame is placed a cylinder and piston mechanism F of ordinary construction, from which a iston rod extends upwardly through tie opening C in the plate 0 into the mold plate receiving recess where a bot tom mold plate D is secured thereto, and articulated upon the perimeter of the bottom mold plate D, are side mold plates D", which are provide adjacent to the upper ends on their inner surfaces with inwardly extending shoulders D which are equal to the thickness of the wall of the container to be molded. G indicates the four strain rods of the apparatus, which extend upwardly through the plates A and B, and the corners of the frame B, and cover plate E with radial-shoulders on said rods G bearing upon the cover plate E, and nuts Gon the lower ends of said strain rods whereby the plate A frame B and cover plate 1) are securely bound and clamped together.

Upon the upper ends of the strain rods G is placed the head plate H of the press, which is securely held in place by the nuts Gr placed upon said strain rods in the usual manner. In the central portion oi the head plate H IS an opening thercthrough, which is provided with stuil'ing box mechanism ll of usual construction. Upon the head plate H is secured a cylinder J in the lower end of which is a piston J to which a hollow piston rod J is secured which extends downwardly therefrom through the stalling box mechanism H. Above the piston J there from which a piston rod K extends downwardly through the hollow piston rod J and upon the lower end of the piston rod K is secured a crosshead K the corners of which engage and are guided by the Vertical strain rods G as shown in Fig. 5.

Secured to the under side of the cross head K is a core-mold L the body of which is adapted to enter between and bear against the upper ends of the side mold plates D so that the space between said core-mold L and said plates below-tho inward shoulders 1) adjacent to the upper ends of said plates will form the mold cavity to be filled with rubber compound.

The hollow piston-rod J is provided at its lower end with a cross-hcad rl and with a stutling box mechanism J' of ordinary construction so that fluid will not escape from the lower end oi said hollow piston rod. The cross-head ll is provided. with downwardly extending rods M which extend downwardly therefrom, through openings in the cross-head K, and have secured on the lower ends thereof, under said cross-head, a frame l /l' adapted to engage the upper ends of the mold-plates D The pistons J and K are arranged within the cylinder J in spaced relation to each other so that fluid under pressure can be introduced between them whereby the piston K will. be forced upward, while the iston J will be forced downwardly whorcliy the mold plates D will be held firmly in place in the mold case, while the core-mold L and cross-head K are being lifted upward. The cylinder J is provided with a fluid supply opening N through which fluid is introduced to move the pistons K and J downward to lower the frame M upon the upper ends of the mold plates 1) and the core mold into the mold;

The cylinder J is also provided with a fluid inlet N whereby fluid can be introduced between the pistons J and K, and with a i'luid inlet pipe N whereby fluid can be introduced into the cylinder J under the piston J whereby the frame M can be raised from the mold plates after the core mold is free from the molded article. l and 1 indicate inlet and outlet pipes for heating or cooling the core mold L, while it and it indicate inlet and outlet pipes for heating or cooling the mold case D, and E7 and S indicate inlet and outlet pipes for heating or cooling the mold case bottom plate, and T and '1" indicate fluid supply pipes for operating the cylinder F.

In operation, the cylinder .13 in the base of tho nuichine is ()JLl'tltOtl to draw the mold plates I) from the position shown in Fig. 2 into the receiving recess D as shown in Fig. l, and the pistons are lowered to the position shown in Fig. 1 so that the core mold l) is within the mold plates. Steam may he then turned into all of the steam ('uvitics until the core mold L and mold ruse l) and bottom plate C, and mold plates D become sullicicully lu-ated, when the pistons J and K are operated to raise the mold col-c l i out o l' the mold, which will also lift the frame M from the upper ends of the mold plates, so that the upper end of the mold is open, into which the proper amount of rubber compound can be placed. The pistons .l and K are operated to lower the (ore-mold l into the mold and. the frame M upon the upper ends of the mold plates D'-. The piston K will force the core mold l; into the mold until the crosshead K rests upon the frame M. The cross head K (an he made as heavy as desired, so that entire (lLlltlHltllt't will not be placed upon the cylinder J and piston K for the required pressure necessary to mold the desired article.

Having thus l'ully shown and described the construction and operation of this invention so that others can utilize the same, I do not desire to limit myself to the exact described saaoaa construction and arrangement shown and ,',as many modifications can be made therein without departing from the i 1. In a molding scope of my invention, therefore. What I claim as new and desire to secure by Letters -mechanis'm adapted to 'lorce'said core-mold into said mold-box and withdraw it thercfrom in opposition to the first mentioned fluid actuated mechanism.

' 2. In a moldin" press for containers, a mold case, moldx plates in said case, means to impart vertical movement to said mold-box plates with relation to said moldcase, a core-mold adapted to enter said mold box and to engage and be guided thereby, fluid actuatedmechanism adapted .to impart vertical movement to said core-mold with relation to saidmold-box plates, and fluid actuated mechanism'enga ing said mold-box plates adapted to maintain them stationary 111 op ositlon to said coremold.

' 3. na molding press for containers, a mold-case, mold box plates in said case, fluid actuated mechanism to elevate said plates with relation to said mold-case, a core-mold, means to press down upon the upper edges ofsaid mold-box plates in said mold case in oppositionto the upward movement of said core-mold, and'means to impart vertical movement to said core-mold with relationtosaid mold-box plates.

4. In a molding press for containers, a main press frame, a mold-case within said frame vhaving a mold-box receiving recess therein, a plate on said frame to secure said mold-case in said main press frame," moldbox plates in saidunoldbox case, strain rods secured. in the corners of said main press frame and extending upwardly therefrom, a. press head plate secured on the upper ends of said strain rods, a fluid cylinder on'saidhead. plate, a lower piston in said cylinder, :1 piston rod extending downward- 1y therefrom-1, means on the lower end of said piston rod hrcngugc said mold box plates, anotherpiston in said cylinder, a piston rod extending downwardlythercl 'rom, a core mold supported on said piston rod and adapted to extend into said mold-box, and a cross-head on said lastmentioncd piston rod and engaging and guided rods.

by said strain 5. In a molding press, a main frame, a

mold case contained within said main frame having a mold receiving and supportin recess therethrough, a separable mol -box comprising bottom and slde'plates adapted to be sup orted by said mold-case, vertical strain rod; secured in the corners main press frame, a cross-head plate slid ably mounted between said strain rods and guided-thereby, a core-mold adapted to en ter said mold box and form the interior of the mold cavity secured to the. under side of of said said cross-head, a fluid cylinder supported upon said strain rods, a piston therein, a piston rod extending downward to and secured to said cross-head, another piston m said cylinder, another piston rod extending" downwardly therefrom, a cross-head on said second mentioned, piston rod, rods secured to said cross-head and extending down wardly through the first mentioned crosshead, a frame between said first mentioned cross-head and the upper ends of saidmold box plates, said frame being secured tosaid last mentioned rods, whereby when fluid is forced between the pistons in said fluid cylinder, the force exerted under the upper piston is also exerted upon the lower piston whereby the mold-box plates are held down While the core-mold is pulled upwardly.

6. In a hot molding press, a hot mold case, a mold-box therein adapted to be heated therefrom, a main press frame having an intcrior'spacc to receive said hot mold case, and insulated therefrom, strain rods secured in the corners of said. main press frame, a cold press head plate, a hydraulic cylinder on said head plate, a hot core-mold and piston rod mechanism operated by said cylinder to operate said hotcore-mold, and a cold cross-head mounted between said strain rods and guided thereby, secured to and operated by said piston rod mechanism.

7. In a molding press for containers, mold-boa plates, a mold box case to receive and support said plates,a core mold to enter said mold-box and thereby complete the mold, pressure mechanism to move said coremold mto said mold-box and remove it therefrom, and pressure mechanism to press downward on szud plates during the removal of said roreanold and to release said )lGS-- HAROLD M. STURG ON. 

